from copy import deepcopy
import re
from typing import Any


# Only numeric data placeholders are normalized. Decorative Korean placeholders such as <소수1+>
# stay untouched and do not consume a value index.
DATA_PLACEHOLDER_PATTERN = re.compile(r'<(?:int|float\d*)[^>]*>')
DECORATIVE_KOREAN_PLACEHOLDER_PATTERN = re.compile(r'<[가-힣]+\d+\+>')
VALUE_PATTERN = re.compile(r'\{value\d+\}')
SKILL_DETAIL_NORMALIZE_VERSION = 'decorative-korean-placeholder-v1'


def replace_placeholders(template: str) -> str:
    idx = 0

    def repl(_: re.Match[str]) -> str:
        nonlocal idx
        idx += 1
        return f'{{value{idx}}}'

    protected = DECORATIVE_KOREAN_PLACEHOLDER_PATTERN.sub(lambda match: f'@@DDECORATIVE_{len(match.group(0))}_{match.start()}@@', template)
    replacements = {
        f'@@DDECORATIVE_{len(match.group(0))}_{match.start()}@@': match.group(0)
        for match in DECORATIVE_KOREAN_PLACEHOLDER_PATTERN.finditer(template)
    }
    normalized = DATA_PLACEHOLDER_PATTERN.sub(repl, protected)
    for token, placeholder in replacements.items():
        normalized = normalized.replace(token, placeholder)
    return normalized


def normalize_skill_detail(skill_data: dict[str, Any]) -> dict[str, Any]:
    level_info = skill_data.get('levelInfo')
    if not isinstance(level_info, dict):
        return skill_data

    option_desc = level_info.get('optionDesc')
    if option_desc is not None:
        level_info['optionDesc'] = replace_placeholders(option_desc)
    return skill_data


def skill_detail_for_level(skill_data: dict[str, Any], level: int | None) -> dict[str, Any]:
    result = deepcopy(skill_data)
    if level is None:
        return result

    level = max(0, min(level, result.get('maxLevel', 0)))
    level_info = result.get('levelInfo')
    if not isinstance(level_info, dict):
        return result

    rows = level_info.get('rows')
    if not isinstance(rows, list):
        return result

    detail = next((row for row in rows if row.get('level') == level), None)
    if not detail:
        return result

    attribute = {**level_info, **detail}
    option_desc = attribute.get('optionDesc')
    attribute['detail'] = option_desc if isinstance(option_desc, str) else ''

    for key, value in (attribute.get('optionValue') or {}).items():
        attribute['detail'] = attribute['detail'].replace(f'{{{key}}}', str(value))
    attribute['detail'] = VALUE_PATTERN.sub('-', attribute['detail'])

    attribute.pop('rows', None)
    result['attribute'] = attribute
    result.pop('levelInfo', None)
    return result